Back brush



FIG. 1 is a front elevation of a back brush showing my design;

FIG. 2 is a rear elevation thereof;

FIG. 3 is a left side elevation thereof;

FIG. 4 is a right side elevation thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective view thereof. 

The ornamental design for a back brush, as shown and described. 